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Genetic Analysis of Receiving Weight, Ultrasound Back Fat, Ultrasound Rib Eye Area, Ultrasound Percent Intramuscular Fat and Bovine Respiratory Disease in Feedlot Cattle

Thursday, August 21, 2014
Posters (The Westin Bayshore)
Scott E. Speidel , Colorado State University, Department of Animal Sciences, Fort Collins, CO
Rebecca R Cockrum , Virginia Polytechnic Institute and State University, Blacksburg, VA
Janeen Salak-Johnson , University of Illinois, Urbana, IL
Christopher Chase , South Dakota State University, Brookings, SD
Milton G. Thomas , Colorado State University, Department of Animal Sciences, Fort Collins, CO
R. Kraig Peel , Colorado State University, Fort Collins, CO
Richard Mark Enns , Colorado State University, Department of Animal Sciences, Fort Collins, CO
Abstract Text:

Crossbred steer calves (n = 2,870) were received at a commercial feedlot in Southeastern Colorado.  Upon arrival, weight (REC), ultrasound back fat (UBF), rib eye area (UREA) and intramuscular fat (UIMF) measures were collected. Animals treated for BRD received a treatment code (TRT) of 1 while animals not treated received a 0.  Univariate sire model heritability estimates were calculated for TRT, REC, UBF, UREA and UIMF.  Genetic correlations were calculated using bivariate sire models.  Heritability estimates for TRT were (0.17 ± 0.08), REC (0.48 ± 0.08), UREA (0.49 ± 0.08), UBF (0.15 ± 0.05) and UIMF (0.33 ± 0.07).  Genetic correlations varied between TRT and REC (0.62 ± 0.20), UREA (0.11 ± 0.22), UBF (-0.31 ± 0.31) and UIMF (0.06 ± 0.24).  Results suggest that BRD resistance is heritable and related to initial feedlot body weight and back fat thickness.

Keywords: beef cattle, bovine respiratory disease, immunity

See more of: Posters: Genetics of Trait Complexes - Disease Resistance (Group 1)
See more of: Genetics of Trait Complexes: Disease resistance
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